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cachefiles: Check that the backing filesystem supports tmpfiles

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Add a check that the backing filesystem supports the creation of
tmpfiles[1].

Suggested-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: linux-cachefs@redhat.com
Link: https://lore.kernel.org/r/568749bd7cc02908ecf6f3d6a611b6f9cf5c4afd.camel@kernel.org/ [1]
Link: https://lore.kernel.org/r/164251406558.3435901.1249023136670058162.stgit@warthog.procyon.org.uk/ # v1
This commit is contained in:
David Howells 2022-01-07 10:57:45 +00:00
parent 14b9d0902d
commit 6633213139
1 changed files with 2 additions and 0 deletions
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2
fs/cachefiles/cache.c
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@ -51,6 +51,7 @@ int cachefiles_add_cache(struct cachefiles_cache *cache)
/* Check features of the backing filesystem:
* - Directories must support looking up and directory creation
* - We create tmpfiles to handle invalidation
* - We use xattrs to store metadata
* - We need to be able to query the amount of space available
* - We want to be able to sync the filesystem when stopping the cache
@ -60,6 +61,7 @@ int cachefiles_add_cache(struct cachefiles_cache *cache)
if (d_is_negative(root) ||
!d_backing_inode(root)->i_op->lookup ||
!d_backing_inode(root)->i_op->mkdir ||
!d_backing_inode(root)->i_op->tmpfile ||
!(d_backing_inode(root)->i_opflags & IOP_XATTR) ||
!root->d_sb->s_op->statfs ||
!root->d_sb->s_op->sync_fs ||